A filtration media recovery system and method

Abstract

The application discloses a filter medium recycling system and method, and relates to the technical field of filter medium recycling. The filter medium recycling system comprises a filtering device, a pumping unit, a suction unit and a controller. The filtering device comprises a main container and a filter arranged in the main container. A space for preloading diatomite residual liquid is arranged between the filter and the main container. The pumping unit is in communication with the main container and the filter respectively. The suction unit is in communication with the filter. The controller is electrically connected with the pumping unit and the suction unit respectively, and is used for controlling the pumping unit to draw liquid from the filter and return the liquid to the main container, so as to reduce the turbidity of the liquid to a preset turbidity. After the liquid with the preset turbidity is discharged, the controller is used for controlling the suction unit to perform air suction until the vacuum degree in the main container is reduced to a preset vacuum degree. According to the filter medium recycling system, diatomite in diatomite residual liquid can be recycled systematically and conveniently.

Description

Technical Field

[0001] This application belongs to the field of filter media recovery technology, specifically a filter media recovery system and method. Background Technology

[0002] Diatomaceous earth is a porous siliceous sedimentary rock formed from the remains of diatom fossils. It is lightweight, porous, and has strong adsorption properties. It is often used for filtering and purifying liquids (such as liquor and cooking oil) to remove suspended particles, colloids, and some microorganisms.

[0003] The filtration of beer, wine, juice, and cooking oil is the largest consumption scenario for diatomaceous earth. Waste diatomaceous earth, which has adsorbed organic matter, yeast, protein, and oil, is wasteful and polluting if directly landfilled. Related technologies use pressure filtration to separate solids and liquids from waste diatomaceous earth, forming a filter cake and residual liquid. The filter cake is reused through regeneration, while the residual liquid is mostly treated at wastewater treatment plants.

[0004] However, the diatomite content in the residual diatomite liquid is still relatively high, and direct discharge as waste liquid will inevitably cause environmental pollution. Therefore, this problem urgently needs to be solved. Summary of the Invention

[0005] The purpose of this application is to provide a filter media recovery system and method for systematically recovering diatomite from diatomite residue, which facilitates centralized treatment.

[0006] To achieve the above objectives, this application provides the following technical solution: In a first aspect, this application provides a filter media recovery system, comprising: A filtration device, comprising a main container and a filter disposed within the main container, with a space between the filter and the main container for pre-filling diatomaceous earth residue; The pumping unit is connected to both the main container and the filter. The suction unit is connected to the filter. The controller is electrically connected to the pumping unit and the suction unit respectively. It is used to control the pumping unit to extract liquid from the filter and return it to the main container to reduce the turbidity of the liquid to a preset turbidity. It is also used to control the suction unit to pump air during or after the liquid reaches the preset turbidity level until the vacuum level in the main container drops to a preset vacuum level.

[0007] As a further embodiment of this application, the pumping unit includes a transfer pump and a turbidity meter, with the outlet of the transfer pump connected to the main container. The inlet of the delivery pump is connected to the inside of the filter, and a turbidity meter is installed on the connecting pipeline. When the turbidity detected by the turbidity meter drops to a preset turbidity, the controller controls the delivery pump to stop.

[0008] As a further embodiment of this application, the pumping unit also includes a first control valve, a second control valve, a third control valve, a first liquid detection element, and a second liquid detection element. The diatomaceous earth residual liquid input source is connected to the inlet of the delivery pump, and the first control valve is installed on the connecting pipeline. The second control valve is installed on the pipeline between the turbidity meter and the inlet of the delivery pump, and the third control valve is installed on the pipeline above the main container that communicates with the outside. The first liquid detection device is used to detect the liquid at the inlet of the delivery pump, and the second liquid detection device is used to detect the liquid level in the main container. The controller controls the opening of the first control valve, the closing of the second control valve, and the opening of the third control valve. When the first liquid detection device detects liquid flowing through, it controls the delivery pump to start to preload the diatomaceous earth residue.

[0009] As a further embodiment of this application, when the liquid level reaches a preset height, the controller controls the first control valve to close, the second control valve to open, and the third control valve to close. When the turbidity detected by the turbidity meter drops to the preset turbidity, the controller stops the delivery pump and closes the second control valve.

[0010] As a further embodiment of this application, the pumping unit also includes a fourth control valve, which is installed on a pipeline inside the main container that communicates with the outside. The controller controls the opening of the fourth and third control valves to drain the liquid from the main container.

[0011] As a further embodiment of this application, the suction unit includes a vacuum pump, a fifth control valve, and a vacuum level detection device. The inlet of the vacuum pump is connected to the upper part of the filter, and a fifth control valve is installed on the connecting pipeline. The vacuum level detection device is used to detect the vacuum level inside the main container. The controller controls the fifth control valve to open and the third control valve to close, and controls the vacuum pump to start. When the vacuum level detected by the vacuum level detector drops to the preset vacuum level, it controls the fifth control valve to close and the vacuum pump to stop.

[0012] As a further embodiment of this application, the filter includes a cylindrical body and at least one plate filter assembly, the cylindrical body being connected to the inner wall of the main container and the plate filter assembly being disposed on the side wall of the cylindrical body.

[0013] As a further embodiment of this application, the plate filter assembly is arranged at an angle, with its lower end offset in a direction away from the axis of the cylinder.

[0014] As a further embodiment of this application, the plate filter assembly includes a recovery disc and a filter layer, with the recovery disc detachably connected to the cylinder. The recovery tray has a recessed trough facing the inside of the cylinder, and several through holes are opened at the bottom of the trough, with the filter layer embedded in the trough.

[0015] Secondly, this application provides a filter media recovery method, applicable to any of the filter media recovery systems provided in the first aspect, the method comprising: Pre-fill the diatomaceous earth residue between the filter and the main container; The controller controls the pumping unit to draw liquid from the filter and return it to the main container to reduce the turbidity of the liquid to a preset level. After the liquid reaches the preset turbidity level and is discharged, the controller controls the suction unit to pump air until the vacuum level in the main container drops to the preset vacuum level.

[0016] According to this application, a filter media recovery system and method are provided, which have at least the following technical effects. The filter media recovery system includes a filtration device, a pumping unit, a suction unit, and a controller. The filtration device includes a main container and a filter disposed in the main container. The filter and the main container are used to pre-fill diatomaceous earth residue. The pumping unit is connected to both the main container and the filter. The suction unit is connected to the filter. The controller is electrically connected to both the pumping unit and the suction unit and is used to control the pumping unit to extract liquid from the filter and return it to the main container to reduce the turbidity of the liquid to a preset turbidity. After the liquid that has reached the preset turbidity is discharged, the controller controls the suction unit to pump air until the vacuum degree in the main container drops to a preset vacuum degree.

[0017] Therefore, according to the filter media recovery system provided in this application, the controller first controls the pumping unit to circulate and filter the diatomaceous earth residue, so that the diatomaceous earth is retained on the filter as much as possible. Then, the controller controls the suction unit to suction the diatomaceous earth layer on the filter, removing as much water as possible to form a semi-dry diatomaceous earth solid. This achieves systematic recovery of diatomaceous earth from the diatomaceous earth residue, which is convenient for centralized treatment, greatly reduces environmental pollution, and also reduces the burden of subsequent treatment of the residue. Attached Figure Description

[0018] To facilitate understanding by those skilled in the art, the present application will be further described below with reference to the accompanying drawings.

[0019] Figure 1 This is a schematic diagram of the first state of the filter media recovery system provided in the embodiments of this application; Figure 2 This is a schematic diagram of the second state of the filter media recovery system provided in the embodiments of this application; Figure 3 This is a schematic diagram of the third state of the filter media recovery system provided in the embodiments of this application; Figure 4 This is a schematic diagram of the fourth state of the filter media recovery system provided in the embodiments of this application; Figure 5 for Figure 1A magnified view of a section at point A in the middle; Figure 6 A flowchart of a filter media recovery method provided in an embodiment of this application.

[0020] Figure label: 100. Filtration equipment; 110. Main container; 120. Filter; 121. Cylinder; 122. Plate filter assembly; 1221. Recovery tray; 1222. Filter layer; 130. Door; 200, Pumping unit; 210, Transfer pump; 220, Turbidity meter; 230, First control valve; 240, Second control valve; 250, Third control valve; 260, First liquid detection element; 270, Second liquid detection element; 280, Fourth control valve; 300. Suction unit; 310. Vacuum pump; 320. Fifth control valve; 330. Vacuum degree detection component. Detailed Implementation

[0021] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0022] In the description of this application, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0023] In the description of this application, "several" means one or more, "more than" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0024] In the description of this application, unless otherwise expressly defined, terms such as "setup," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this application in conjunction with the specific content of the technical solution.

[0025] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of this application and are not intended to limit the application; that is, the described embodiments are only a part of the embodiments of this application, and not all of them. The components of the embodiments of this application described and shown in the accompanying drawings can typically be arranged and designed in various different configurations.

[0026] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0027] Firstly, please refer to Figures 1 to 5 As shown in the figure, this application provides a filter media recovery system, including: The filtration device 100 includes a main container 110 and a filter 120 disposed within the main container 110, with the filter 120 positioned between the main container 110 and the main container for pre-filling diatomaceous earth residue.

[0028] The main container 110 is used to pre-fill the diatomaceous earth residue, and the filter 120 is located inside the main container 110.

[0029] The pumping unit 200 is connected to the main container 110 and the filter 120 respectively.

[0030] The suction unit 300 is connected to the filter 120.

[0031] The controller is electrically connected to the pumping unit 200 and the suction unit 300 respectively, and is used to control the pumping unit 200 to extract liquid from the filter 120 and return it to the main container 110 to reduce the turbidity of the liquid to a preset turbidity. After the liquid that has reached the preset turbidity is discharged, the controller controls the suction unit 300 to pump air until the vacuum degree in the main container 110 drops to a preset vacuum degree.

[0032] The filter media recovery system provided in this embodiment can be used for the recovery of diatomaceous earth, as well as for the recovery of other filter media that can be retained.

[0033] The filtration device 100 in this embodiment includes at least a main container 110 and a filter 120. The main container 110 can be a closed structure such as a tank, barrel, box, or shell. The filter 120 is used to filter the diatomaceous earth residue to retain the diatomaceous earth. It can be a rotating body, box, shell, or other structure. The filter 120 can be fixedly installed on the inner wall of the main container 110. For example, the bottom of the filter 120 can be inserted into the bottom of the main container 110 through a support tube. The filter 120 is hollow inside and has a filter layer on it. The space between the outer wall of the filter 120 and the inner wall of the main container 110 is used to hold the diatomaceous earth residue to be treated. When the diatomaceous earth residue passes through the filter layer, at least part of the diatomaceous earth can be retained on the filter layer, and the remaining liquid containing water can enter the interior of the filter 120.

[0034] In this embodiment, the pumping unit 200 is used at least to allow the diatomaceous earth residue in the main container 110 to enter the filter 120 after filtration and then return to the circulation in the main container 110. It is connected to the lower part of the main container 110 and the upper part of the filter 120 through pipelines.

[0035] In this embodiment, the suction unit 300 is used to provide negative pressure suction inside the filter 120 so that air passes through the filter layer on the filter 120 and dehydrates the diatomaceous earth on it. It can be composed of a negative pressure pump, control valve, etc., and is connected to the upper part of the filter 120 through a pipeline.

[0036] In this embodiment, the controller is used to coordinate the sequential operation of the pumping unit 200 and the suction unit 300. It can be a microcontroller, PLC, etc., and is electrically or communicatively connected to the pumping unit 200 and the suction unit 300, respectively.

[0037] in, Figure 1 This diagram illustrates the working mode of pre-filled diatomaceous earth residual liquid. Figure 2 This diagram illustrates the working mode of cyclic filtering. Figure 3 A schematic diagram illustrating the working mode of discharging liquid. Figure 4 A schematic diagram illustrating the working mode of suction dehydration.

[0038] Specifically, such as Figure 1 As shown, the diatomaceous earth residue to be treated is first pre-filled between the filter 120 and the main container 110. Then, the controller controls the pumping unit 200 to extract the liquid from the filter 120 and return it to the main container 110. Figure 2As shown, under the action of circulating filtration, diatomaceous earth in the liquid continuously deposits on filter 120. As the deposition thickness increases, it further prevents finer diatomaceous earth from passing through the filter layer, thereby reducing the turbidity of the liquid to a preset level. At this point, the liquid meets the standard, and a diatomaceous earth layer is formed on the filter layer of filter 120. Then, pumping unit 200 stops working, discharging the liquid between main container 110 and filter 120. Figure 3 As shown, air is introduced while the liquid is being discharged. After the liquid reaches the preset turbidity level and is discharged, the controller then controls the suction unit 300 to pump air. Figure 4 As shown, during suction, a negative pressure or vacuum is formed inside the filter 120, and the moisture in the diatomaceous earth layer is sucked out until the vacuum degree in the main container 110 drops to the preset vacuum degree, so that the diatomaceous earth layer becomes semi-dry. Then the suction unit 300 stops, and the semi-dry diatomaceous earth on the filter 120 can be taken out, thereby realizing the systematic recycling.

[0039] In addition, turbidity and vacuum can be detected by sensors or manually using a detector. Specific preset values ​​for turbidity, vacuum, etc., can be determined according to actual needs; this embodiment does not impose specific limitations.

[0040] Therefore, in the application of the filter media recovery system provided in this application embodiment, the controller first controls the pumping unit 200 to perform circulating filtration treatment on the diatomaceous earth residue, so that the diatomaceous earth is retained on the filter as much as possible. Then, the controller controls the suction unit 300 to perform suction treatment on the diatomaceous earth layer on the filter, removing as much water as possible to form a semi-dry diatomaceous earth solid. This achieves systematic recovery of diatomaceous earth in the diatomaceous earth residue, which is convenient for centralized treatment, greatly reduces environmental pollution, and also reduces the burden of subsequent treatment of the residue.

[0041] In some embodiments, the pumping unit 200 includes a delivery pump 210 and a turbidimeter 220, with the outlet of the delivery pump 210 communicating with the main container 110.

[0042] The inlet of the delivery pump 210 is connected to the filter 120, and a turbidity meter 220 is installed on the connecting pipeline. When the turbidity detected by the turbidity meter 220 drops to a preset turbidity, the controller controls the delivery pump 210 to stop.

[0043] In this way, such as Figure 2 As shown, the outlet of the transfer pump 210 (i.e., B1) can be connected to the bottom of the main container 110 ( Figure 1 The turbidity meter 220 (i.e., ZD) is connected at position a in the middle. It is used to detect the turbidity of the liquid after passing through the filter 120 and feeds it back to the controller. It will continue to circulate and filter until the preset turbidity is reached. Once the preset turbidity is reached, the controller will control the delivery pump 210 to stop.

[0044] The specific types and specifications of the transfer pump 210 and the turbidity meter 220 can be determined according to actual needs, and no excessive restrictions are imposed in this embodiment.

[0045] Furthermore, in this embodiment, the pumping unit 200 also includes a first control valve 230, a second control valve 240, a third control valve 250, a first liquid detection element 260, and a second liquid detection element 270. The diatomaceous earth residual liquid input source is connected to the inlet of the delivery pump 210, and the first control valve 230 is provided on the connecting pipeline. The second control valve 240 is provided on the pipeline between the turbidity meter 220 and the inlet of the delivery pump 210. The third control valve 250 is provided on the pipeline above the main container 110 that communicates with the outside.

[0046] The first liquid detector 260 is used to detect the liquid at the inlet of the transfer pump 210, and the second liquid detector 270 is used to detect the liquid level in the main container 110. The controller controls the first control valve 230 to open, the second control valve 240 to close, and the third control valve 250 to open. When the first liquid detector 260 detects liquid flowing through, it controls the transfer pump 210 to start to pre-fill the diatomaceous earth residue.

[0047] Specifically, the first control valve 230 (FC-1), the second control valve 240 (FC-2), and the third control valve 250 (FC-3) can all be electrically controlled valves. The first liquid detection element 260 (y1) and the second liquid detection element 270 (y2) can be liquid detectors. The first liquid detection element 260 can be located at the top of the main container 110 (e.g., at point d). Alternatively, the upper end of the air duct extends to the top of the main container 110, and the lower end extends from the bottom of the main container 110. The first liquid detection element 260 can also be located at the lower end of the air duct.

[0048] Among them, such as Figure 1 As shown, when pre-filling of diatomaceous earth residue is required, the controller controls the first control valve 230 to open, the second control valve 240 to close, and the third control valve 250 to open. When the first liquid detection element 260 detects liquid flow, it controls the delivery pump 210 to start, thus pre-filling the diatomaceous earth residue and meeting the system's automatic loading requirements. The specific types of the first control valve 230, second control valve 240, third control valve 250, first liquid detection element 260, and second liquid detection element 270 can be determined according to actual needs, and this embodiment does not impose too many restrictions.

[0049] Furthermore, in this embodiment, when the liquid level reaches a preset height, the controller controls the first control valve 230 to close, the second control valve 240 to open, and the third control valve 250 to close.

[0050] When the turbidity detected by the turbidity meter 220 drops to the preset turbidity, the controller controls the delivery pump 210 to stop and controls the second control valve 240 to close.

[0051] Specifically, such as Figure 2 As shown, when liquid is detected passing through the second liquid detector 270, it indicates that the system is full. At this time, the controller can close the first control valve 230, open the second control valve 240, and close the third control valve 250, entering the circulation filtration mode. When the turbidity detected by the turbidity meter 220 drops to the preset turbidity, it indicates that the liquid has met the standard and the diatomaceous earth residue has been effectively filtered. Subsequently, the controller controls the delivery pump 210 to stop and controls the second control valve 240 to close, facilitating the one-step discharge of liquid and further meeting the system's automatic loading requirements.

[0052] Furthermore, in this embodiment, the pumping unit 200 also includes a fourth control valve 280, which is disposed on a pipeline inside the main container 110 that communicates with the outside.

[0053] The controller controls the fourth control valve 280 and the third control valve 250 to open, so as to discharge the liquid in the main container 110.

[0054] Specifically, such as Figure 3 As shown, the fourth control valve 280 (i.e., FC-4) can also be an electrically controlled valve. When the controller controls the fourth control valve 280 to open and the third control valve 250 to open, the liquid in the main container 110 is discharged through the fourth control valve 280, while air is introduced from the third control valve 250 to balance the pressure difference. The specific type of the fourth control valve 280 can be determined according to actual needs, and this embodiment does not impose too many restrictions.

[0055] Furthermore, in this embodiment, the suction unit 300 includes a vacuum pump 310, a fifth control valve 320, and a vacuum degree detection element 330. The inlet of the vacuum pump 310 is connected to the upper part of the filter 120, and the fifth control valve 320 is provided on the connecting pipeline. The vacuum degree detection element 330 is used to detect the vacuum degree inside the main container 110.

[0056] The controller controls the fifth control valve 320 to open and the third control valve 250 to close, and controls the vacuum pump 310 to start. When the vacuum level detected by the vacuum level detection element 330 drops to the preset vacuum level, the controller controls the fifth control valve 320 to close and the vacuum pump 310 to stop.

[0057] Specifically, such as Figure 4As shown, the fifth control valve 320 (FC-5) can be an electrically controlled valve, and the vacuum detection element 330 (ZK) can be a vacuum gauge, which is inserted into the main container 110. After the liquid in the main container 110 is discharged, the controller controls the fifth control valve 320 to open and the third control valve 250 to close, and controls the vacuum pump 310 (B2) to start. Under the suction action, a vacuum is formed in the filter 120, and air passes through the diatomaceous earth layer, thereby continuously dehydrating it to form a semi-dry state for easy recovery. When the vacuum level drops to the preset vacuum level, it indicates that the dehydration process is complete. At this time, the controller controls the fifth control valve 320 to close and the vacuum pump 310 to stop. The specific types and specifications of the vacuum pump 310, the fifth control valve 320, and the vacuum detection element 330 can be determined according to actual needs, and are not specifically limited in this embodiment.

[0058] It is worth noting that the entire process, from the pre-loading of diatomaceous earth residue to the formation of semi-dry diatomaceous earth, is carried out through a systematic operation with a higher degree of automation, enabling continuous operation and reducing processing costs.

[0059] In some embodiments, the filter 120 includes a cylinder 121 and at least one plate filter assembly 122, the cylinder 121 being connected to the inner wall of the main container 110, and the plate filter assembly 122 being disposed on the side wall of the cylinder 121.

[0060] For example, such as Figure 1 , Figure 5 As shown, mounting ports are opened around the perimeter of the cylinder 121. Multiple mounting ports are evenly distributed around the axis of the cylinder 121. A plate filter assembly 122 is installed at each mounting port. This can be combined with the space inside the main container 110 to make full use of the large area on the side wall of the cylinder 121 and achieve a reasonable arrangement of the filter layer.

[0061] The specific number of plate filter components 122 can be determined according to actual needs, and no specific limitation is made in this embodiment.

[0062] Furthermore, in this embodiment, the plate filter assembly 122 is arranged at an angle, and its lower end is offset in a direction away from the axis of the cylinder 121.

[0063] That is, such as Figure 1 , Figure 5 As shown, while making full use of the filtration area, the filter layer is made to form a certain angle with the horizontal plane, such as 75°~88°. The plate filter assembly 122 is offset radially outward to provide a certain sliding resistance to the sparse diatomaceous earth, preventing the diatomaceous earth from failing to deposit on the filter layer. The specific tilt angle of the plate filter assembly 122 can be determined according to actual needs, and is not specifically limited in this embodiment.

[0064] Furthermore, in this embodiment, the plate filter assembly 122 includes a recovery tray 1221 and a filter layer 1222, with the recovery tray 1221 detachably connected to the cylinder 121.

[0065] The recycling tray 1221 has a recessed groove facing the inside of the cylinder 121, and several through holes are opened at the bottom of the groove. The filter layer 1222 is embedded in the groove.

[0066] Specifically, such as Figure 5 As shown, the recycling tray 1221 and the cylinder 121 can be connected in a detachable manner through snap-fit ​​or plug-in methods, facilitating the retrieval and cleaning of diatomaceous earth. Simultaneously, by embedding the filter layer 1222 into the settling groove of the recycling tray 1221, the diatomaceous earth is facilitated to settle in the settling groove through the filtration action of the filter layer 1222. Furthermore, the filter layer 1222 is easy to install and replace, resulting in a simple structure that is less prone to detachment.

[0067] In addition, the filtration device 100 also includes a door 130, and a manhole is provided on the side wall of the main container 110. The door 130 is opened and closed at the manhole.

[0068] Specifically, such as Figure 1 As shown, the manhole allows the operator to easily remove the diatomaceous earth from the filter 120 and facilitates internal maintenance. The door 130 is used to close or open the manhole and can be connected to the outer wall of the main container 110 via hinges, pivots, or other components.

[0069] The specific shape, size, and position of the manhole and door 130 can be determined according to actual needs, and this embodiment does not impose too many restrictions.

[0070] Secondly, such as Figure 6 As shown, this application embodiment also provides a filter media recovery method, applied to the filter media recovery system in any of the above embodiments, including the following steps: S101. Pre-fill the diatomaceous earth residue between the filter 120 and the main container 110.

[0071] Specifically, the residual diatomaceous earth solution to be treated can be injected into the space between the filter 120 and the main container 110 by pumping until it is full.

[0072] S102, The controller controls the pumping unit 200 to draw liquid from the filter 120 and return it to the main container 110 to reduce the turbidity of the liquid to a preset turbidity.

[0073] Specifically, under the action of circulating filtration, diatomaceous earth in the liquid is continuously deposited on the filter 120, and as the deposition thickness increases, it further prevents finer diatomaceous earth from passing through the filter layer, so as to reduce the turbidity of the liquid to the preset turbidity. At this time, the liquid has reached the standard, a diatomaceous earth layer is formed on the filter layer of the filter 120, and then the pumping unit 200 stops working.

[0074] S103. After the liquid reaches the preset turbidity level and is discharged, the controller controls the suction unit 300 to pump air until the vacuum level in the filter 120 drops to the preset vacuum level.

[0075] Specifically, the liquid between the main container 110 and the filter 120 is discharged, and air is introduced at the same time. After the liquid reaches the preset turbidity level and is discharged, the controller controls the suction unit 300 to pump air. Air is also introduced during the pumping process. During the pumping, a negative pressure is formed inside the filter 120, and the air passes through the diatomaceous earth layer until the vacuum level inside the filter 120 drops to the preset vacuum level, making the diatomaceous earth layer semi-dry. Then the suction unit 300 stops, and the semi-dry diatomaceous earth on the filter 120 can be removed, thereby achieving systematic recycling.

[0076] Therefore, the filter media recovery method provided in this application embodiment first controls the pumping unit 200 to circulate and filter the diatomaceous earth residue, so that the diatomaceous earth is retained on the filter as much as possible. Then, the suction unit 300 is controlled to suction the diatomaceous earth layer on the filter to remove as much water as possible, forming a semi-dry diatomaceous earth solid. This achieves systematic recovery of diatomaceous earth from the diatomaceous earth residue, which is convenient for centralized treatment, greatly reduces environmental pollution, and also reduces the burden of subsequent treatment of the residue.

[0077] The above content is merely an example and illustration of the structure of this application. Any modifications or additions made by those skilled in the art to the specific embodiments described, or any substitutions made in a similar manner, shall fall within the protection scope of this application.

Claims

1. A filter media recovery system, characterized in that, include: A filtration device (100) includes a main container (110) and a filter (120) disposed within the main container (110), wherein the filter (120) is positioned between the main container (110) and the main container (110) for pre-filling diatomaceous earth residue. A pumping unit (200) is connected to the main container (110) and the filter (120), respectively; A suction unit (300) is connected to the filter (120); The controller is electrically connected to the pumping unit (200) and the suction unit (300) respectively, and is used to control the pumping unit (200) to extract liquid from the filter (120) and return it to the main container (110) to reduce the turbidity of the liquid to a preset turbidity. After the liquid reaches the preset turbidity and is discharged, the controller controls the suction unit (300) to pump air until the vacuum degree in the main container (110) drops to a preset vacuum degree.

2. The filter media recovery system according to claim 1, characterized in that, The pumping unit (200) includes a delivery pump (210) and a turbidity meter (220), and the outlet of the delivery pump (210) is connected to the inside of the main container (110); The inlet of the delivery pump (210) is connected to the filter (120), and the turbidity meter (220) is installed on the connecting pipeline. When the turbidity detected by the turbidity meter (220) drops to the preset turbidity, the controller controls the delivery pump (210) to stop.

3. The filter media recovery system according to claim 2, characterized in that, The pumping unit (200) further includes a first control valve (230), a second control valve (240), a third control valve (250), a first liquid detection element (260), and a second liquid detection element (270). The diatomaceous earth residual liquid input source is connected to the inlet of the delivery pump (210), and the first control valve (230) is installed on the connecting pipeline. The second control valve (240) is installed on the pipeline between the turbidity meter (220) and the inlet of the delivery pump (210). The third control valve (250) is installed on the pipeline above the main container (110) that communicates with the outside. The first liquid detection element (260) is used to detect the liquid at the inlet of the delivery pump (210), and the second liquid detection element (270) is used to detect the liquid level in the main container (110). The controller controls the first control valve (230) to open, the second control valve (240) to close, and the third control valve (250) to open. When the first liquid detection element (260) detects liquid flowing through, it controls the delivery pump (210) to open to pre-fill the diatomaceous earth residue.

4. The filter media recovery system according to claim 3, characterized in that, When the liquid level reaches a preset height, the controller controls the first control valve (230) to close, the second control valve (240) to open, and the third control valve (250) to close. When the turbidity detected by the turbidity meter (220) drops to the preset turbidity, the controller controls the delivery pump (210) to stop and controls the second control valve (240) to close.

5. The filter media recovery system according to claim 4, characterized in that, The pumping unit (200) also includes a fourth control valve (280), which is disposed on a pipeline communicating with the outside inside the main container (110); The controller controls the fourth control valve (280) to open and the third control valve (250) to discharge the liquid in the main container (110).

6. The filter media recovery system according to claim 5, characterized in that, The suction unit (300) includes a vacuum pump (310), a fifth control valve (320), and a vacuum level detection device (330). The inlet of the vacuum pump (310) is connected to the upper part of the filter (120), and the fifth control valve (320) is installed on the connecting pipeline. The vacuum level detection device (330) is used to detect the vacuum level inside the main container (110). The controller controls the fifth control valve (320) to open and the third control valve (250) to close, and controls the vacuum pump (310) to start. When the vacuum level detected by the vacuum level detector (330) drops to the preset vacuum level, the controller controls the fifth control valve (320) to close and the vacuum pump (310) to stop.

7. The filter media recovery system according to any one of claims 1 to 6, characterized in that, The filter (120) includes a cylindrical body (121) and at least one plate filter assembly (122), the cylindrical body (121) being connected to the inner wall of the main container (110), and the plate filter assembly (122) being disposed on the side wall of the cylindrical body (121).

8. The filter media recovery system according to claim 7, characterized in that, The plate filter assembly (122) is arranged at an angle, and its lower end is offset in a direction away from the axis of the cylinder (121).

9. The filter media recovery system according to claim 7, characterized in that, The plate filter assembly (122) includes a recovery disc (1221) and a filter layer (1222), wherein the recovery disc (1221) is detachably connected to the cylinder (121); The recycling tray (1221) has a recessed groove that is recessed towards the inside of the cylinder (121), and several through holes are opened at the bottom of the groove. The filter layer (1222) is embedded in the groove.

10. A method for recovering filter media, characterized in that, The method, applied to the filter media recovery system as described in any one of claims 1 to 9, comprises: The diatomaceous earth residue is pre-filled between the filter (120) and the main container (110); The controller controls the pumping unit (200) to extract the liquid from the filter (120) and return it to the main container (110) to reduce the turbidity of the liquid to the preset turbidity; After the liquid reaches the preset turbidity and is discharged, the controller controls the suction unit (300) to pump air until the vacuum level in the main container (110) drops to the preset vacuum level.

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